[DebugInfo] Allow bundled calls in the MIR's call site info

Summary:
Extend the MIR parser and writer so that the call site information can
refer to calls that are bundled.

Reviewers: aprantl, asowda, NikolaPrica, djtodoro, ivanbaev, vsk

Reviewed By: aprantl

Subscribers: arsenm, hiraditya, llvm-commits

Tags: #debug-info, #llvm

Differential Revision: https://reviews.llvm.org/D66145

llvm-svn: 369256

1 files changed, 47 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/MIR/Hexagon/bundled-call-site-info.mir b/llvm/test/CodeGen/MIR/Hexagon/bundled-call-site-info.mir
new file mode 100644
index 00000000000..5ffa0293a2e
--- /dev/null
+++ b/llvm/test/CodeGen/MIR/Hexagon/bundled-call-site-info.mir
@@ -0,0 +1,47 @@
+# RUN: llc -debug-entry-values -run-pass=none -verify-machineinstrs -o - %s | FileCheck %s
+
+# Verify that it is possible to read and write MIR where a callSites entry
+# points to a call residing in a bundle. The offset should point to the call
+# instruction, rather than the bundle head.
+
+# CHECK: name: caller
+# CHECK: callSites:
+# CHECK-NEXT: bb: 0, offset: 3, fwdArgRegs:
+# CHECK-NEXT:   arg: 0, reg: '$r0'
+
+# XXX: Please note that at the time of creating this test the Hexagon target
+# did not support call site information, so the "callSites" array has been
+# manually added.
+
+--- |
+  target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
+  target triple = "hexagon"
+
+  define i32 @caller() {
+  entry:
+    tail call void @callee(i32 12345)
+    ret i32 0
+  }
+
+  declare void @callee(i32)
+
+...
+---
+name:            caller
+tracksRegLiveness: true
+callSites:
+  - { bb: 0, offset: 3, fwdArgRegs:
+      - { arg: 0, reg: '$r0' } }
+body:             |
+  bb.0.entry:
+    BUNDLE implicit-def $r29, implicit-def $r30, implicit-def dead $r0, implicit-def dead $pc, implicit-def dead $r31, implicit $r29, implicit killed $framekey, implicit killed $framelimit, implicit killed $r30, implicit killed $r31 {
+      $r29 = S2_allocframe $r29, 0, implicit-def $r30, implicit killed $framekey, implicit killed $framelimit, implicit killed $r30, implicit killed $r31 :: (store 4 into stack)
+      $r0 = A2_tfrsi 12345
+      J2_call @callee, hexagoncsr, implicit-def dead $pc, implicit-def dead $r31, implicit internal killed $r29, implicit internal killed $r0, implicit-def $r29
+    }
+    BUNDLE implicit-def dead $r0, implicit-def $d15, implicit-def $r30, implicit-def $r31, implicit-def $pc, implicit-def $r29, implicit killed $r30, implicit killed $framekey {
+      $r0 = A2_tfrsi 0
+      $d15 = L4_return killed $r30, implicit-def $pc, implicit-def $r29, implicit killed $framekey, implicit-def dead $pc, implicit internal killed $r0
+    }
+
+...